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Evolution of magnetic fluctuations in Sr(Co<sub>1-x</sub>Ni<sub>x</sub>)<sub>2</sub>P<sub>2</sub> revealed by <sup>31</sup>P NMR

ORAL

Abstract

After the discovery of unconventional superconductivity in Fe pnictides, much attention has been paid to the related materials AM2(As,P)2 (A = Ca, Sr, and Ba, and M = 3d transition metal elements) with the ThCr2Si2-type structure. Among them, the Co compounds have been found to show a rich variety of magnetic properties. Recently, Schmidt et al. reported the Ni substitution effect on Sr(Co1-xNix)2P2 where only a 2 % Ni substitution to the nonmagnetic SrCo2P2 was found to lead to a ferromagnetic (FM) ordering [1]. They also reported that an antiferromagnetic (AFM) ordered phase appears by further Ni-substitution with x = 0.06-0.35 and disappears around x = 0.42 [1]. Here, we have carried out 31P NMR to investigate the static and dynamic physical properties of Sr(Co1-xNix)2P2 from a microscopic point of view [2]. From the analysis of the NMR data, FM spin fluctuations are found to dominate in the FM Sr(Co1-xNix)2P2 as well as the AFM compounds. With further Ni substitution up to x = 0.57 through x = 0.42, we found that such FM spin fluctuations disappear entirely, leading to a noncorrelated metal without showing any indication of quantum critical behavior around x = 0.42 in Sr(Co1-xNix)2P2.



[1] J. Schmidt et al., Phys. Rev. B 108, 174415 (2023).

[2] N. Furukawa et al., Phys. Rev. B 110, 014439 (2024).

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Publication: N. Furukawa et al., Phys. Rev. B 110, 014439 (2024).

Presenters

  • Yuji Furukawa

    Iowa State University, Ames National Laboratory, and Department of Physics and Astronomy, Iowa State University, Ames National Laboratory, Iowa State University

Authors

  • Yuji Furukawa

    Iowa State University, Ames National Laboratory, and Department of Physics and Astronomy, Iowa State University, Ames National Laboratory, Iowa State University

  • Nao Furukawa

    Iowa State University

  • Qing-Ping Ding

    Ames National Laboratory, Ames National Laboratory, U.S.DOE

  • Juan Schmidt

    Ames National Laboratory, Ames National Laboratory, and Department of Physics and Astronomy, Iowa State University

  • Sergey L Bud'ko

    Iowa State University, Ames National Laboratory, and Department of Physics and Astronomy, Iowa State University, Ames National Laboratory and Iowa State University

  • Paul C Canfield

    Iowa State University, Ames National Laboratory, and Department of Physics and Astronomy, Iowa State University, Ames National Laboratory and Iowa State University